Lathe dog



Sept. 6, 1938.

A. C. PACHER LATHE DOG I Filed June 30, 1857 IXNVENTOR zj h C- Packer ATTORNEY6 WITNESSE Patented Sept. 6, 1938 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to lathe dogs and particularly to an improved construction wherein a plurality of clamping screws are used to hold the work in proper place. 7

An object of the invention is to provide a dog either with a curved or straight tail arranged to readily clamp work of different shapes and different sizes.

Another object of the invention is to provide a dog wherein there is presented a plurality of clamping set screws and clamping blocks.

A further object of the invention is to provide a dog in which removable and interchangeable shoes may be utilized either with one or two clamping screws.

In the accompanying drawing:

Fig. 1 is an elevation of a lathe dog disclosing an embodiment of the invention, certain parts being broken away for better illustrating the construction Fig. 2 is a sectional View through Fig. 1 approximately on the line 22;

Fig. 3 is a detail sectional view through Fig. 1 approximately on the line 3-3;

Fig. 4 is an elevation of a shoe with its shank embodying certain features of the invention;

Fig. 5 is a front view of the shoe shown in Fig. 4;

Fig. 6 is a view similar to Fig. 4 but showing a smaller shoe with a smaller groove.

Referring to the accompanying drawing by numerals, l indicates the body of the dog which may be provided with a suitable tail or horn 2. From an examination of Figs. 1 and 2 it will be 35 seen that the dog is made very strong and sturdy throughout. The body I is provided with enlargements or bosses 3, 4 and 5 and between these enlargements or bosses the body is formed substantially as shown in Fig. 3, namely with a straight flat inner surface 6 with curved outer surfaces 1 and 8 merging into a rounded outer edge 9. This results in great strength with a minimum amount of material. The respective bosses 3 and 4 are provided with threaded apertures in which the set or clamping screws Ill and II are mounted. These screws are adapted to press against the work H as the workman may desire. The boss 5 together with the body I adjacent thereto are provided with a broached hole or socket it which is preferably square in cross section so as to receive the square shank M of the shoe l5. Preferably the shank l4 does not quite extend through the hole to facilitate the removal of the shoe l5 internally. This arrangement also results in the curved surfaces l6 and ll properly fitting against the curved inner surface 6 of the body I. In this way the strain of the set screw II] against work l2 will be applied to shoe l5 and communicated to the body l instead of to the bottom of the socket l3. Shoe i5 is provided with a straight working surface it which is interrupted by a V-shaped groove H! as shown particularly in Fig. 5. This groove must be located in the center of the shoe and is provided so that cylindrical or irregular shaped pieces of work may be properly received and properly centered by the shoe I 5 and the set screws 0 and l I. In case the shoe I5 is too large a similar but smaller shoe 2!] shown in Fig. 6 may be used.

It will be noted that shoe 20 has the same size shank M as shank l4 so as to properly fit into the hole or socket l3. It will be evident that larger shoes than shoe l5 with larger V-shaped grooves may be used if desired, or even smaller shoes than shoe 28. Preferably six shoes of different sizes are provided with each dog whereby the work may be properly centered within the dog.

I claim:

A lathe dog comprising a substantially ringshaped body having a radially extending bore, a shoe having a body formed with a work-receiving face, an arc-shaped back fitting against the inner wall of said ring-shaped body, and a shank fitting into said bore, a set screw on the diametrically opposite side of said substantially ring shaped body to said bore, said set screw being adjustable toward and from said bore, and a second set screw carried by said substantially ring-shaped body and adjustable toward and from the center of the substantially ring-shaped body in a direction at an angle to the first mentioned set screw.

ADOLPH C(PACHER. 

